Sensing device for automatic braking of the spindle in ring spinning and ring twisting machines

ABSTRACT

A device which automatically regulates yarn tension including a lever upon which resultant yarn forces act and which forces are counterbalanced by the weight distribution of the lever: a spindle brake actuator is held in an inactive position until released by lever movement occasioned by yarn breakage.

[56] References Cited UNITED STATES PATENTS 1/1952 Thomas............. 2,599,256 6/1952 Hartley et a1.

lnventor Kazimerz Adamaszek Komorowice Kreis Bielska-Bialej near, Poland Appl. No. 804,152

United States Patent 2,716,858 9/1955 Schaum........ 2,786,324 3/1957 Keith et a1. 2,840,979 7/1958 Harman..... 3,132,466 5/ 1 964 Preisser 1 [22] Filed Mar.4, 1969 [45] Patented May 4,1971 [32] Priority Mar. 7, 1968 1 1 y regulates yarn nt yarn forces act by the weight distribuator is held in an inactive by yarn 3,141,287 7/1964 Bourgeas................ Primary Examiner.1ohn Petrakes Att0rney1rvin A. Lavine ABSTRACT: A device which automaticall tension including a lever upon which resulta 57/80 and which forces are counterbalanced D0lh 13/16 tion of the lever: a spindle brake actu 57/78, 80, position until released by lever movement occasioned 79, 81 breakage.

Poland 1 125,648

[54] SENSINGDEVICE FOR AUTOMATIC BRAKING OF THE SPINDLE-IN RING SPINNING AND RING TWISTING MACHINES 9 Claims, 4 Drawing Figs.

mhm m d .1 ale HF .11 0 55 [l PATENTEUYMAY ME]?! INVENTOR KAZIMERZ ADAMASZEK ATTORNEY SENSING DEVICE FOR AUTOMATIC BRAKING OF THE SPINDLE IN RING SPINNING AND RING TWISTING MACHINES The invention device is intended to render more efficient the operation of a spinning frame and twisting machine by decreasing the yarn breakage.

The invention device facilitates in great measure an operation of the spinning frame and decreases the required number of operators in relation to the number of spindles operated.

The invention device has the advantage over the prior art that regulation of the yarn tension in twisting zone takes place automatically, but not mechanically. In the prior art mechanical devices a strict adjustment of position of the yarn guide to the spindle head was very difficult and practically impossible, because of frequent changes in quality of the yarn processed as well as various conditions at each individual spindle dependent upon the momentary state of the ring, traveler, bobbin, etc.

According to the invention construction the sensing device automatically regulates the yarn tension in relation to the general conditions at the spinning frame and according to conditions at each individual spindle.

The action of the sensing device is as follows: In the case of a decrease in the yarn tension at the yarn twisting section, i.e. between delivery rollers and yarn guide, the sensing device swings forward causing a lifting of the yarn guide and an automatic increase in the yarn tension.

In turn the increase of the yarn tension causes the sensing device to return to the initial position or to move to a new position-suited to the momentary conditions.

In this case the yarn tension in the twisting zone maintains itself in definite limits.

The invention device protects particularly against decrease of the yarn tension below the operational limit, when it would cause the yarn to wind on the spindle below the spindle head and consequently cause yarn breakage.

Another advantage of the present invention sensing device is in the caseof yarn breakage; the sensing device through a lever arrangement of the device causes an automatic braking of the spindle, which prevents the fraying of the free end of the broken yarn.

This fraying is very intensive and causes an expulsion of loose fiber tufts, which contaminate excessively the machine and neighboring machines as well. Individual fibers fall into the ballon orbit and the traveler orbit of other spindles, causing in a short time the chain breakage" of the yarns along the spinning frame. It leads to a decrease of the efficiency and even causes the operator to stop the machine.

FIG. 1 shows a side view of the sensing device of the spinning frame and parts of the spinning machine.

FIG. 2 shows an alternative construction of the sensing device, operating with a solenoid.

FIG. 3 shows a horizontal cross section of the spring, which guides and supports the pull rod operating the brake.

FIG. 4 shows the sensing device of FIG. 1 together with the yarn guide in side view, at an enlarged scale.

In FIG. 1 above the spindle 1 there are mounted the yarn guide 3 and sensing device 4, which is pivotally mounted for movement on axis 2.

The Geometry of the yarn guide 3 and of the sensing device 4 the system of forces which are in balance during the spinning are shown in FIG. 4.

The weight arrangement of yarn guide 3 and sensing device 4tightly connected to each otheris such that the center of gravity of the assembly is on the right side of the vertical plane passing through the axis 2, and thus creates force G in the system of forces.

The force G is balanced by the forces S and S the magnitudes of which are related to the yarn tension S of the yarn 14.

When force S decreases, force S also decreases and in consequence of force G causes the assembly to turn in the clockwise direction.

Swinging forward the yarn guide 3 from position I to position II results in increase of the yarn tension S, and at the same time in increase of the force 5,, and decrease of the angle a, which makes a further increase of force 5..

As a result the sensing device 4 together with the yarn guide 3 move in the opposite, counterclockwise direction thereby causing an oscillating movement of the assembly till the balance has been attained. The yarn guide 3 together with sensing device 4 are mounted on the small flap 5, which is nonrotatably mounted on the shaft 6 and is supported by bracket 7 which is fastened tightly to the shaft 6.

Inside the bracket 7 is placed a rod 8.

Under the lower end of the pushrod 8 is the left arm 9 of lever 10. The right arm of this lever supports the pull rod 12.

5 The pull rod 12 is pushed against the lever by the spring 13.

When the yarn 14 breaks, the sensing device 4 together with the yarn guide 3 rotates in the clockwise direction as a consequence of the action of force G and because of kinetic energy strikes the push rod 8.

Afterwards the pushrod 8 presses down the lever 10, which rotates, and releases the pull rod 12 which actuates a brake (not shown) for spindle I.

The released pull rod 12 is pressed by the spring 13 so that it is contacted by a continuously oscillating lever 15, which is moved by machine-driven gearing. The end of lever 15 engages the catch 16 of the pull rod 12 and pulls it up to cause braking of spindle l.

The downward return motion of the lever 15 releases the catch 16 and together with it the pull rod 12, which swings clockwise due to the force of gravity, because the center of gravity of the pull rod 12 is on the right side of the vertical plane passing through the point of support 17.

The supporting lever 10 can return to its original position in consequence of greater weight of its right arm than of its left arm. Besides turning, respectively, bundling of the yarn 14 leads itself through the yarn guide 3 and sensing device 4 which return to the working position and release the pressure of the pushbutton 8 on the lever 10, which goes into a position supporting the pull rod 12. After disengagement of the spindle brake, the pull rod 12 drops, goes into contact with the spring 13 and rests on the lever 10 and activated spindle 1 permits the fixing of the yarn and resumption of normal work.

FIG. 2 shows the second alternative solution in which impulse from the sensing device 4 on the lever 10" is transmitted by means the solenoid 18.

The principle is as follows: when the yarn l4 breaks the sensing device strikes upon the push 8', which breaks the electric circuit 19 of the solenoid. The core 20 of the solenoid 18 raises the lever 10, releasing it from supporting the pull rod 12. The remaining principles of operation are the same as these described by FIG. 1.

lclaim:

l. A device for automatically regulating yarn tension and for automatically braking the spindle in a ring spinning and ring twisting machine comprising a yarn guide above a spindle and a sensing device having a first part engaged by the yarn and a second part secured to said yarn guide, means supporting said guide and sensing device for rotational movement, at least part of the weight of said guide and sensing device producing a moment which counterbalances moments produced on said guide and device by the tension of the yarn.

2. The device of claim 1, and further comprising means for actuating a spindle brake, and means for'releasing said actuating means in response to excess movement of said guide and sensing device upon yarn breakage.

3. The device of claim 2, said actuating means comprising a spring-urged lever, said releasing means comprising holding means engaging said lever for preventing movement thereof, and means engageable by said guide and sensing device for releasing said holding means.

4. The device of claim 3, said holding means comprising a lever.

5. The device of claim 4, said last-mentioned lever having its center of gravity between its axis and said spring-urged lever.

8. The device of claim 7, said spring-urged lever comprising means engageable by said oscillating lever upon movement thereof into the path of said oscillating lever.

9. The device of claim 2, said releasing means comprising a solenoid, a switch engageable by said guide and sensing device, and a circuit connecting said solenoid and switch. 

1. A device for automatically regulating yarn tension and for automatically braking the spindle in a ring spinning and ring twisting machine comprising a yarn guide above a spindle and a sensing device having a first part engaged by the yarn and a second part secured to said yarn guide, means supporting said guide and sensing device for rotational movement, at least part of the weight of said guide and sensing device producing a moment which counterbalances moments produced on said guide and device by the tension of the yarn.
 2. The device of claim 1, and further comprising means for actuating a spindle brake, and means for releasing said actuating means in response to excess movement of said guide and sensing device upon yarn breakage.
 3. The device of claim 2, said actuating means comprising a spring-urged lever, said releasing means comprising holding means engaging said lever for preventing movement thereof, and means engageable by said guide and sensing device for releasing said holding means.
 4. The device of claim 3, said holding means comprising a lever.
 5. The device of claim 4, said last-mentioned lever having its center of gravity between its axis and said spring-urged lever.
 6. The device of claim 3, said spring-urged lever having a leaf spring engaging a portion thereof, said spring having a groove therein receiving said lever.
 7. The device of claim 2, said means for actuating a spindle brake including a lever oscillating through an arc and a spring-urged lever movable into the path of said oscillating lever, said releasing means including means for holding said spring-urged lever out of the path of said oscillating lever.
 8. The device of claim 7, said spring-urged lever comprising means engageable by said oscillating lever upon movement thereof into the path of said oscillating lever.
 9. The device of claim 2, said releasing means comprising a solenoid, a switch engageable by said guide and sensing device, and a circuit connecting said solenoid and switch. 